Control valve



May 11, 1954 J. D. DITSON 2,678,056

Patented May 11, 1954 UNITED STATES CONTROL VALVE Original application May 12, 1948, Serial No. 26,549. Divided and this application October TENT OFFICE 25, 1951, Serial No. 253,059

2 Claims.

This is a divisional application from my copending application, Serial No. 26,549, filed May 12, 1948, now abandoned, for a Control Valve and has to do with the invention as disclosed in Figures 3 and l of the drawing. The invention shown in Figure 2 is claimed in the parent application.

This invention relates to a control valve unit in which the how of one fluid is dependent on the Fig. 2 is a sectional elevation of the present invention, and

Fig. 3 is a transverse view of Figure 2 taken along the line 8-3.

Referring to the drawings, it designates, in general, a valve unit connected in the air and Water supply lines H and I2 respectively, for a rock drill Hi. The valve body or the unit It has a pair of passages l and it for air and flow of the second fluid, and more particularly 10 water, and within the air passage is a valve to a valve unit intended for connection in the air means for controlling the how of air therethrough and'water supply lines of a rock drill to preactuated by the flow of water through the pasvent the continued operation of the drill in the sageway H5. event the flow of water through the drill is dis- The intermediate portion of the air passage i5 rupted. 15 forms a chamber 41 having an annular groove It has been the practice to provide rock drills t2 therearound which is in communication with of the type to which this invention appertains, the outlet end d3 of the air passage 5. The porwith mechanisms which prevent the operation of tion of the valve body which forms the open the drill in the event that the pressure of the or mouth portion of the groove 4'2, protrudes into water supplied to the rock drill should fall bethe chamber iii to form parallel ridges 44 which low a predetermined value. Many of these mechanisms, though effective in shutting down the rock drill in such an event, have been unsatisfactory in other respects. For example, many of these mechanisms are dependent on seals between relatively moving parts to prevent the air and water from being intermixed. This is of course unsatisfactory and in some cases extremely dangerous, in that after the seals have become worn some air leaks into the water and forms bubbles which will, in the course of the drilling, carry dust from the hole to contaminate the air breathed by the operator of the drill. Also, many of these mechanisms are dependent on the pressure of the water supply for their operation and it is readily obvious that the drill will continue to operate even though little or no water actually passes through the drill steel, as for example when the water passage is restricted or stopped up downstream from the mechanism.

It is accordingly one object of my invention to construct a control valve of the type to which this invention relates, which precludes the possible intermixing of the fluids.

Another object of my invention is to make the flow of one fluid dependent on the amount of flow of another fluid.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this specification and in which similar reference numerals refer to similar parts,

Figure 1 is a side view of a rock drill embodying the present invention and a mounting for a rock drill,

served as a seal for the valve member 65. The valve 45, in this instance, is Wheel shaped with its axis transverse from the flow of fiuid through the chambers M, and so positioned it separates chamber 4| into compartments which are communicated through holes ,6 in the member 45. The outer flange portion or rim M of the member 45 cooperates with the ridges 46 to cut off communication between the chambers 4| and the groove 42, or effectively, between the inlet and outlet ends 48 and 43 in the air passage 15.

The valve 45 is held in position by resilient members such as the metallic bellows 49 and 59 attached on the opposite sides of the valve and encircling the central perforation or orifice 34 therein. The bellows t9 and 5B are impervious to fluid and define fluid tight expansible chambers on the opposite sides of the valve 45 and have their ends secured in a fluid tight manner to the members to which. they are adapted. The outer end of the bellows #29 is attached to a member 38 in a fluid tight relationship while the other end of the bellows 5!! is secured to a circular member 5! having a peripheral flange 52 which is held against the valve body by a nut 53 threaded in the valve body. The member BI is of at least the same diameter as the valve 45 to permit easy access to the moving parts of the control unit.

A passage 54 through the member 5| communicates the water line i2 with the bellows 5!] so that the resilient members M and c0- operate with the orifice 3 5 to form that portion of the water passage which extends transversely through the air passage l5. With this arrangement transverse movement of the valve memher 45 for establishing or cutting ofi communication between the groove 42 and the chamber 4! will occur in accordance with a flow of water through the orifice 3-4 of an arbitrarily selected order.

In operation the spring bellows 49 and 56 exert equal pressures on the valve member 45 so that communication is cut off between the chamber M and the groove it whenever the amount of flow of water through the orifice 3 or the pressure differential between the chambers 1 is below a predetermined value. amount of flow through the orifice, exceeds said value the pressure drop in the downstream side of the valve member 45 will be su'fiicient to bias the valve into the open position and thereby establish communication between the chamber 4! and the groove 42. It is to be noted here that due, to the construction of the valve, the operation of the valve is independent of the direction of ,fiow of either fluid therethrough.

It is apparent from the above discussion that the control unit herein disclosed and described provides a relatively simple yet highly sensitive means of making the new of fluid in one passage dependent on the rate of flow of fluid in another passage, and in which the possibility of leakage of fluid from one passage to the other is'reduced to a minimum.

While I have shown and described a specific form of my invention, it is to be understood that various changes and modifications may be made without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. A valve unit for connection in air and water However, when the supply lines of a rock drill, comprising a valve body having an air passage and a water passage, valve means for controlling the air passage, resilient members located in the air passage and forming a portion of the water passage, means attached to said members for creating a pressure difierential in the water flowing through said members, and means acting responsively to said pressure differential for directly actuating said valve.

2; valve unit for connection in the air and water supply lines of a rock drill, comprising a valve body having separate air and water passages, a member in the water passage and having an orifice therethrough, bellows secured to the opposite sides of said member and encircling the orifice, said bellows forming a section of the water passage, seating surfaces located in the air passage, and a rim on the said member for cooperating with the seating surfaces in the air passage to control the flow of air therethrough.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,699,163 Schiske Jan. 15, 1929 1,850,051 Sponar Mar. 15, 1932 2,154,777 Schlalos Apr. 18, 1939 2,371,720 Stine Mar. 20, 1945 FOREIGN PATENTS Number Country Date 7 784,210 France July 22, 1935 wi A... 

